Pound Thai chilies into a fine paste.
Add garlic and chillies and pound into a rough paste. If you dont't have a mortar and pestle, just chop this finely instead.
Prepare the stir fry sauces: soy sauce, fish sauce, black soy sauce, water and sugar. If you use the Thai soy sauce, you can omit the sugar and dark soy sauce.
In a wok or a large saute pan, saute the garlic-chili paste in a little oil over medium high heat until the garlic starts to turn golden.
If you are using the alternative dry holy basil, add this now to rehydrate and release flavour as it cooks.
Add chicken and stir fry until the meat changes colour and is cooked. Add the stir fry sauce and continue stir frying for at least 2 mins.
Remove from heat and stir in the fresh holy basil. Taste to adjust seasoning.
Spoon over steamed rice.
Crispy fried egg
Heat a generous amount of oil in the wok over medium high heat. To get the crispy edges, you need to submerge the egg in oil to shallow fry.
Once the oil is hot, crack the egg directly into the pan. Fry until the edges are crispy and frilly.
Serve the Pad Kra Pao with rice and top it with the fried egg.